Omron JZA User Manual page 127

The acceleration or deceleration times are too
short.
The drive is attempting to operate a
specialized motor or a motor larger than the
maximum size allowed.
Magnetic contactor (MC) on the output side
of the drive has turned on or off.
V/f setting is not operating as expected.
Excessive torque compensation.
Drive fails to operate properly due to noise
interference.
Overexcitation gain is set too high.
Run command applied while motor was
coasting.
The motor cable is too long
LED Operator Display
oFA01
Cause
The option unit is not properly connected to
the drive.
LED Operator Display
Cause
Surrounding temperature is too high.
Load is too heavy.
Current flowing to control circuit terminal +V
exceeded the tolerance level.
LED Operator Display
Cause
Load is too heavy.
Cycle times are too short during acceleration
and deceleration.
• Drive overloaded at low speeds.
• Overload may occur at low speeds when
using a general-purpose motor, even if
operating within the rated current
limitation.
Although a special type of motor is being
used, the motor protection selection is set for
a general-purpose motor (L1-01 = 1).
Voltage is too high for the V/f characteristics.
The wrong motor-rated current is set to
E2-01.
The maximum frequency for the drive input
power is set too low.
Multiple motors are running off the same
drive.
The electrical thermal protection
characteristics and motor overload
characteristics do not match.
The electrical thermal relay is operating at the
wrong level.
SIEP C710606 33A OYMC AC Drive – J1000 User Manual
Calculate the torque needed during acceleration relative to the load inertia and the specified acceleration
time.
If the right amount of torque cannot be set, make the following changes:
• Increase the acceleration time (C1-01, -03 )
• Increase the S-curve characteristics (C2-01 through C2-04)
• Increase the capacity of the drive.
• Check the motor capacity.
• Ensure that the rated capacity of the drive is greater than or equal to the capacity rating found on the
motor nameplate.
Set up the operation sequence so that the MC is not tripped while the drive is outputting current.
• Check the ratios between the voltage and frequency.
• Set parameter E1-04 through E1-10 appropriately.
• Lower the voltage if it is too high relative to the frequency.
• Check the amount of torque compensation.
• Reduce the torque compensation gain (C4-01) until there is no speed loss and less current.
• Review the possible solutions provided for handling noise interference.
• Review the section on handling noise interference and check the control circuit lines, main circuit
lines and ground wiring.
• Check if fault occurs simultaneously to overexcitation function operation.
• Consider motor flux saturation and reduce the value of n3-13 (Overexcitation Deceleration Gain).
• Program the Speed Search command input through one of the multi-function contact input terminals
(H1- = "61" or "62").
Use a larger drive.
Option Unit Fault
Replace the option unit.
Turn the power off and reconnect the option unit.
Overheat 1 (Heatsink Overheat)
oH1
The temperature of the heatsink has exceeded the overheat detection level.
• Check the temperature surrounding the drive.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool the surrounding area.
• Remove anything near the drive that might be producing excessive heat.
• Measure the output current.
• Lower the carrier frequency (C6-02).
• Reduce the load.
• Check the current level of the terminal.
• Set the current to the control circuit terminal to be 20 mA or less.
Motor Overload
oL1
The electrothermal sensor tripped overload protection.
Reduce the load.
Increase the acceleration and deceleration times (C1-01 through C1-04).
• Reduce the load.
• Increase the speed.
• If the drive is supposed to operate at low speeds, either increase the motor capacity or use a motor
specifically designed to operate with the drive.
Set L1-01 = "2".
• Adjust the user set V/f patterns (E1-04 through E1-10). Parameters E1-08 and E1-10 may need to
be reduced.
• If E1-08 and E1-10 are set too high, there may be very little load tolerance at low speed.
• Check the motor-rated current.
• Enter the value written on the motor nameplate to parameter E2-01.
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
Disable the Motor Protection function (L1-01 = "0") and install a thermal relay to each motor.
• Check the motor characteristics.
• Correct the value set to L1-01 (Motor Protection Function).
• Install an external thermal relay.
• Check the current rating listed on the motor nameplate.
• Check the value set for the motor-rated current (E2-01).
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
6.4 Fault Detection
6
125